Jean Rooney is a poor girl who hails from a faraway village. She only shows up in Normal Mode's True Ending, though she is given a more prominent role in the 2020 remake's Blood Mode.

Jean is shown to a sweet and energetic young woman, if somewhat shy. She blushed when Aya noted how beautiful her green eyes are, noting that no one has ever complimented her before. Additionally, Jean notes to herself how beautiful Aya looks upon their first meeting. She also aspires to become a doctor in hopes of curing people afflicted with her illness.

Following her death, she begins to haunt Aya's soul once it arrives in the dimension that acts as a recreation of the infamous night that changed Aya's life. While mostly staying out of sight and/or reach, Jean does attempt to drown Aya at one point. However, despite that one incident, it's implied that Jean is very reluctant to actually kill Aya, which seems to be further supported by the fact that one of her CG shots is titled "Reluctance".